Electrical attachment-plug.



W. G. FELLOWS. ELEGTRIGAL ATTACHMENT PLUG.

V APPLIOATIOH FILED DEC. 22, 1910. 1,009,659.

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Patented Nov. 21, 1911 luomuw UNITED STATESWPKTENT OFFICE.

WALTER C. FELLOWS. OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO KELLER MANUFACTURING COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF DELAWARE.

ELECTRICAL ATTACHMENT-PLUG.

Specification of Letters Patent. Patented NOV. 21, 1911.

Application filed December 22, 1910. Serial No. 598,679.

To (LZ whom it may concern:

Be it known that l, \VAIJIi-zn C. Fi-zLLows, of Philadelphia, in the county of lhilatlelphia tllltl State of Pennsylvania, have inventetl certain new-aunt useful llllpl'tfl'tll'ltltt i in Electrical Attuelnnent-llugs, whereof the following is a speeitit'ution. reference heing hint to the aeroinpnnying drawings.

My inwntion relntes to an attachment plug, such as may be usetl ut the end of a flexible lt'tltl for the purpose of plugging into a pocket tllltl ltns referent-e to the means eniployetl for so set-tiring the end of the leutl to the plug as to il\tlltl imposing strain upon either the wires of the lLlltl or their Connertions within the plug.

in the :u-(:ont mi| \'ing rlruwings, Figure l, is :1. plan \it:\\', tllnl Fig. ll, it sitle \'l(\\' of :t plug enthottsing my invention. Fig. Ill, is a. horizontal. sectional \it-w, the upper half of the plug heing rem u-tl. Figs. IV, uutl V, are th-tuil perspei-tire News of parts hereinafter tlesrrihetl.

The plug 1, is t'oruu-tl of insulating tnuterial tllltl is properly h:tpe l to snugly lit the sot-ltet. for which it is tlesignetl. It consists of half portions 2, f2. united by screws ii.

The inner faces of the half portions are suitubly eut uwn) to ueeonuuozlute the lnetal strips l, 1, the hiniling sr'rews 5, 5, tllltl the lot-king contact points on springs t3, t3, the ltttt lt being in proper relation to guide holes 7, 7, through which suituhle (utililtt points may be. caused to puss into elt-t-ll'ienl engagement with the 'wking springs, as well understood in the art.

At the end of the plug to \Vllltll the lezul is to he seeuretl un ztttnelunent pieee in the form of it ring 1 (most t'tt:ttl shown in Fig. V), is provitletl. ln onler to lirnil so cure this ring to the plug. I prefer to Illttlit' it of IlHlttl, and rust integrally with it two plates or lugs ll, ll, 'whirh rest within vorl'thlitllltllllg jllfthkt'tfi between the hull' poitions of the plug; ito whieh it is nltzu'lu-tl, ll) serows l2, l2, put sing through hoth the plug untl saitl philos.

The interior ol' the ring 1), is ('onetl so 215 to tliulinish in llttlllL'lUl' toward the owl l'ztrthest from the plug. This ('(iItl'll intel'iol'te eeives n eonit'ul split. hushing 15, the outer surface of \vhioi is rolled in mirrespontlenee with the interior surl'ure ol' the ring 10. The

bushing may be made of fiber or other suituhle nuiteriul. It is split so as to-give it ruptu-ity for expansion and contraction, and only conveniently be split at two points as shown in Fig. IV. The bushing is internully roughened us by providing it with a st-rew tlll't'tltl or with corrugations. The in ternul tliunteter of the bushing is such us to tightl receive the entl of a twin lLtltl 20, \\'llll'lt is to be attached to the plug. The wires from the end of the twin lend pass to their respective binding screws with sulli t-ient sluclt' to prevent (lll'Ot'Zt pull thereon.

\Yhen the hushing is inserted within its t'onir'ztl socket in the ring 20, the pressure upon the split litlsllilt?! t'orees it to tightly grip the end of the twin leatl, and owing to the engagement of the ('OIllCtll surfaces of the hushing 15, untl the rin 10, any pull upon the twin letul ('nuses tie bushing to the more tightly grip the lentl so ill: to pret-lutle the possihility of the leaul being so far pulletl from its grasp' as to allow the indi- \ithtul wires of the lead or their connections to rem-ire any of the strain.

llnriug thus tlest'ribed my invention, I eluitn:-

1. An lltt'ltltitl plug formed in two parts seeuretl together fut-e to fare and provitletl with recesses for the eleetrieul connections, on attachment. ])lt.lt5 having it tuperetl openin; mmununit-uting with the interior of the plug, :uul provitlt-tl with attaching tlevit-es extt-ntling lN'lWt'l'll the meeting loves of the plug int-tubers, :tllll :t split t'luinping hushing: mounted in the suitl tapered openin".

lneinhers l ving l'nre to futre, recesses for the tltt'lllttll t-onnertions tllltl hating registerin; openings, un utturhing pie-(e having it lllptlt'tl opening lezuliug to suitl recess and lll'UYlllttl with ours or lugs, exte nling between the plug ineluhers, and having apertures, st-rews exteutling through the npertures in the plug nit-uihers and ears, tllltl. a split. ehnuping bushing mounted in the saitl' tnpert-tl openin".

.l. In an elertrieal tluehment plug, the t-otnhinulion of :I. split/ pihg qlotly, an inlet'ioll (.Ulltll ring willrtittnt' ltuent pl'utes whieh :u'e st-t-uretl between the hotly ptit'tions ol' the phi"; hintliug posts and Contact; springs within the plug; a. twin leznll'l'zlssing through the ring with its wires attached to In testimony whereof, I have hereunto said binding posts; and a bushing having signed my name at Philadelphia, Pennsylits outer surface coned in correspondence to Vania, this twentieth da of December 1910. 10

the inner surface of the ring while the inner WALTE C. FELLOWS. 5 surface of the bushing is roughened to take Witnesses:

hold of the end of the lead the more tightly JAMES H. BELL,

the more it is pulled from the plug. E. L. FULLERTON. 

